From e1cb9df9355a6ae67aac76dbcde209b8f70796ee Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Thu, 20 Feb 2020 21:56:37 +0000
Subject: git release.

---
 vector.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 vector.c

(limited to 'vector.c')

diff --git a/vector.c b/vector.c
new file mode 100644
index 0000000..21a3711
--- /dev/null
+++ b/vector.c
@@ -0,0 +1,54 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include "dat.h"
+#include "fns.h"
+
+Vector
+Vec(double x, double y)
+{
+	return (Vector){x, y};
+}
+
+Vector
+Vpt(Point p)
+{
+	return (Vector){p.x, p.y};
+}
+
+Vector
+addvec(Vector v, Vector u)
+{
+	return (Vector){v.x+u.x, v.y+u.y};
+}
+
+Vector
+subvec(Vector v, Vector u)
+{
+	return (Vector){v.x-u.x, v.y-u.y};
+}
+
+Vector
+mulvec(Vector v, double s)
+{
+	return (Vector){v.x*s, v.y*s};
+}
+
+double
+dotvec(Vector v, Vector u)
+{
+	return v.x*u.x + v.y*u.y;
+}
+
+Vector
+normvec(Vector v)
+{
+	double len;
+
+	len = hypot(v.x, v.y);
+	if(len == 0)
+		return (Vector){0, 0};
+	v.x /= len;
+	v.y /= len;
+	return v;
+}
-- 
cgit v1.2.3